B-Rhythm

B rhythms are a variety of rhythmic patterns that are observed in the beta range. The beta rhythm is the rhythm of brain activity that oscillates at a rate of approximately 13–45 Hz (usually in the range of 14–30 Hz). It received this name because when studying the EEG, a pronounced peak maximum was noticed in the central part of the cerebral cortex approximately at this frequency level. Along with other well-known terms from Bethe's thesaurus, the name "B" for this rhythm was coined to distinguish it from other similar concepts.

The concept of “beta range” includes an oscillation frequency of about 15–30 Hz in the time interval from approximately the 20th second to the first ten minutes after the start of the experiment. Another similar term is “beta activity”. B-rhythm speaks of a complex pattern that combines many, many potentials.

Waves in this range of brain activity can be classified as random oscillatory stimuli, even with the high oscillations observed in cortical activity. The latter are generally characteristic of active processes, but the very fact of their presence is due to the addition of random harmonics. That is why it is difficult to talk about any specific activity based on several waves. It is also assumed that slow waves may be part of the signal that occurs without the obvious development of coherent structures. This phenomenon is called extracoherence. It is believed that it is characteristic of a healthy brain. However, a case is possible when b-waves are expressed, having electroencephalographic data, in an altered state of consciousness of the patient.